package com.example.shixunqq;

import android.app.ProgressDialog;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Toast;

import androidx.fragment.app.Fragment;

import com.example.shixunqq.databinding.ChooseAreaBinding;
import com.example.shixunqq.db.City;
import com.example.shixunqq.db.County;
import com.example.shixunqq.db.Province;
import com.example.shixunqq.util.HttpUtil;
import com.example.shixunqq.util.Utility;

import org.jetbrains.annotations.NotNull;
import org.litepal.LitePal;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.Response;

public class ChooseAreaFragment extends Fragment {

    public static final int LEVEL_PROVINCE = 0;
    public static final int LEVEL_CITY =1 ;
    public static final int LEVEL_COUNTY = 2;

    // 进度对话框
    private ProgressDialog progressDialog;

    // 列表组件所需的适配器组件
    private ArrayAdapter<String> adapter;

    // 列表数据
    private List<String> dataList = new ArrayList<>();

    // 省份表
    private List<Province> provinceList;

    // 城市表
    private List<City> cityList;

    // 县区表
    private List<County> countyList;

    // 选中的省份
    private Province selectedProvince;

    // 选中的城市
    private City selectedCity;
    private int currentLevel;
    ChooseAreaBinding binding;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        binding = ChooseAreaBinding.inflate(inflater, container, false);
        adapter= new ArrayAdapter<>(getContext(), android.R.layout.simple_list_item_1,dataList);
        binding.listView.setAdapter(adapter);
        return binding.getRoot();
    }

    @Override
    public void onDestroyView() {
        super.onDestroyView();
        binding = null;
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        binding.listView.setOnItemClickListener((adapterView, view, position, id) -> {
            if (currentLevel == LEVEL_PROVINCE) {
                selectedProvince = provinceList.get(position);
                queryCities();
            } else if (currentLevel == LEVEL_CITY) {
                selectedCity = cityList.get(position);
                queryCounties();
            } else  if (currentLevel == LEVEL_COUNTY) {
                String weatherId = countyList.get(position).getWeatherId();
                Intent intent = new Intent(getActivity(), WeatherActivity.class);
                intent.putExtra("current_province", selectedProvince.getProvinceName());
                intent.putExtra("current_city", selectedCity.getCityName());
                intent.putExtra("current_county", countyList.get(position).getCountyName());
                intent.putExtra("weather_id", weatherId);
                startActivity(intent);
                getActivity().finish();
            }
        });
        binding.backButton.setOnClickListener(v -> {
            if (currentLevel == LEVEL_COUNTY) {
              queryCities();
            } else if (currentLevel == LEVEL_CITY) {
                queryProvinces();
            }
        });
        queryProvinces();
    }

    private void queryProvinces() {
        binding.titleText.setText("中国"); // 设置标题为“中国”
        binding.backButton.setVisibility(View.GONE); // 隐藏返回按钮

        provinceList = LitePal.findAll(Province.class); // 从数据库中查询所有省份
        if (provinceList.size() > 0) { // 如果查询结果不为空
            dataList.clear(); // 清空数据列表
            for (Province province : provinceList) { // 遍历省份列表
                dataList.add(province.getProvinceName()); // 将省份名称添加到数据列表中
            }
            adapter.notifyDataSetChanged(); // 通知适配器数据已更改
            binding.listView.setSelection(0); // 设置列表视图选中第一项
            currentLevel = LEVEL_PROVINCE; // 设置当前级别为省份
        } else { // 如果查询结果为空
            String address = "http://guolin.tech/api/china"; // 设置服务器地址
            queryFromServer(address, "province"); // 从服务器查询省份数据
        }
    }

    /**
     * 根据传入的地址和类型从服务器上查询省市县数据
     * @param address URL地址
     * @param type 类型（省份、城市、区县）
     */
    private void queryFromServer(String address, String type) {
        showProgressDialog(); // 显示进度对话框
        HttpUtil.sendOkHttpRequest(address, new Callback() { // 发送HTTP请求
            @Override
            public void onFailure(@NotNull Call call, @NotNull IOException e) {
                // 请求失败时，在主线程显示Toast提示
                getActivity().runOnUiThread(() -> {
                    Toast.makeText(getContext(), "加载失败！", Toast.LENGTH_SHORT).show();
                });
            }

            @Override
            public void onResponse(@NotNull Call call, @NotNull Response response) throws IOException {
                String responseText = response.body().string(); // 获取服务器响应内容
                boolean result = false; // 初始化处理结果为false
                if ("province".equals(type)) { // 如果是查询省份
                    result = Utility.handleProvinceResponse(responseText); // 处理省份响应数据
                } else if ("city".equals(type)) { // 如果是查询城市
                    result = Utility.handleCityResponse(responseText, selectedProvince.getId()); // 处理城市响应数据，需要传入选中的省份ID
                } else if ("county".equals(type)) { // 如果是查询区县
                    result = Utility.handleCountryResponse(responseText, selectedCity.getId()); // 处理区县响应数据，需要传入选中的城市ID
                }
                if(result){
                    getActivity().runOnUiThread(()->{
                        closeProgressDialog();
                        if("province".equals(type)){
                            queryProvinces();
                        }else if("city".equals(type)){
                            queryCities();
                        }else if("county".equals(type)){
                            queryCounties();
                        }
                    });
                }

            }
        });
    }



    // 关闭进度对话框的方法
    private void closeProgressDialog() {
        if(progressDialog!=null){
            progressDialog.dismiss();
        }
    }

    // 显示进度对话框的方法
    private void showProgressDialog() {
        if(progressDialog==null){
            progressDialog=new ProgressDialog(getActivity());
            progressDialog.setMessage("正在加载...");
            progressDialog.setCancelable(false);
        }
        progressDialog.show();
    }

    /**
     * 查询选中省内所有的市，优先从数据库查询，如果没有查询到再去服务器上查询
     */
    private void queryCities() {
        binding.titleText.setText(selectedProvince.getProvinceName());
        binding.backButton.setVisibility(View.VISIBLE);

        cityList = LitePal.where("provinceid=?", String.valueOf(selectedProvince.getId()))
                .find(City.class);
        if (cityList.size() > 0) {
            dataList.clear();
            for (City city : cityList) {
                dataList.add(city.getCityName());
            }
            adapter.notifyDataSetChanged();
            binding.listView.setSelection(0);
            currentLevel = LEVEL_CITY;
        } else {
            int provinceCode = selectedProvince.getProvinceCode();
            String address = "http://guolin.tech/api/china/" + provinceCode;
            queryFromServer(address, "city");
        }
    }

    /**
     * 查询选中市内所有的县，优先从数据库查询，如果没有查询到再去服务器上查询
     */
    private void queryCounties() {
        binding.titleText.setText(selectedCity.getCityName());
        binding.backButton.setVisibility(View.VISIBLE);

        countyList = LitePal.where("cityid=?", String.valueOf(selectedCity.getId()))
                .find(County.class);
        if (countyList.size() > 0) {
            dataList.clear();
            for (County county : countyList) {
                dataList.add(county.getCountyName());
            }
            adapter.notifyDataSetChanged();
            binding.listView.setSelection(0);
            currentLevel = LEVEL_COUNTY;
        } else {
            int provinceCode = selectedProvince.getProvinceCode();
            int cityCode = selectedCity.getCityCode();
            String address = "http://guolin.tech/api/china/" + provinceCode + "/" + cityCode;
            queryFromServer(address, "county");
        }
    }

}
